Privacy Policy

Last updated: August 18, 2026

1. The short version

Our calculators run entirely in your browser. We do not collect, transmit, or store any of the numbers you enter. This site is designed so you can verify that claim: disconnect from the internet and any calculator still works.

2. Information we may collect

We may use privacy-friendly, aggregated analytics (such as page-view counts) to understand which tools are useful. Where third-party advertising or analytics services are used, they may process standard technical data (e.g. IP address, browser type) under their own privacy policies. We do not sell personal data.

3. Cookies

We use a minimal cookie/local-storage marker to remember that you have accepted this policy. Advertising partners may set their own cookies in accordance with their policies. You can block cookies in your browser settings; the calculators will continue to work.

4. Data from calculations

No calculation inputs or results are sent to our servers. This applies to every tool on this site, now and in the future. If we ever add cloud-based features, we will update this policy and ask for consent where required.

5. GDPR & international visitors

For visitors in the European Economic Area, we process data on the legal bases described above (legitimate interest for aggregate analytics, consent for non-essential cookies). You may contact us to request information about or deletion of any data we hold about you.

6. Children's privacy

This site is not directed at children under 13, and we do not knowingly collect information from children.

7. Changes to this policy

If we change this policy, we will update the "Last updated" date at the top of this page.

8. Contact

Questions about privacy? Email 1280268550@qq.com.